Date: Fri, 5 Jan 2001 08:04:10 -0800 (PST) From: "Thomas D. Dean" <tomdean@speakeasy.org> To: smp@freebsd.org; Subject: Re: Continuing Fatal Trap 12 Message-ID: <200101051604.f05G4Af04311@celebris.tddhome> In-Reply-To: <5.0.2.1.2.20010104215541.00a63c38@pozo.com> (message from Manfred Antar on Thu, 04 Jan 2001 21:55:57 -0800) References: <5.0.2.1.2.20010104215541.00a63c38@pozo.com>
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Why does printing work correctly in UP but not SMP? I believe this
patch masks a more serious problem in SMP.
I still have system 'freezes' in SMP during 'make world'. In UP,
'make world' completes without error.
Since printing seems to function normally in UP, the patch should be:
--- lpt.c Thu Dec 7 17:33:12 2000
+++ lpt.c.hack Thu Jan 4 00:46:41 2001
@@ -394,6 +394,7 @@
/* retrieve the ppbus irq */
BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq);
+#if !defined(SMP)
if (irq > 0) {
/* declare our interrupt handler */
sc->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ,
@@ -403,9 +404,12 @@
sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ;
device_printf(dev, "Interrupt-driven port\n");
} else {
+#endif
sc->sc_irq = 0;
device_printf(dev, "Polled port\n");
+#if !defined(SMP)
}
+#endif
lprintf(("irq %x %x\n", irq, sc->sc_irq));
lpt_release_ppbus(dev);
tomdean
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